Post strike aerial view of Nagasaki. 26th June 1946. An area about 2.3 miles by 1.9 miles had been destroyed by the bombing of August 9; 1945. The Fat Man bombed weighed about 10;000 lbs and was 10 feet 8 inches long. It had the explosive capacity of about 20;000 tons of high explosives. The number of deaths might have been more than 75;000. Nagasaki was a major shipbuilding city and a large military port. Nagasaki; Japan.